Not at all. If merchants wanted to ditch high-fee credit cards and spend the money they save on advertising or lower prices to win back the customers they lose

Not at all. If merchants wanted to ditch high-fee credit cards and spend the money they save on advertising or lower prices to win back the customers they lose as a result, they could do that tomorrow. Cash and debit cards are available alternatives. They don’t because it would be a worse use of their $$.